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Reviewing preprocessors creates a unique problem. We talked about them pretty late in the semester, but they are best when implemented of a project. The reason for this disparity is where the learning curve lies. You have to understand CSS as a style language in order to get any mileage out of . Thus, for this review, we begin with the files in order to show how they work with the CSS concepts. We've talked about modularity, and how the file architechture is laid out . There is the index, our , main.css, the file (which is quite large), main.scss (the file that is being processed into a ), mixins.scss (which contains, unsurprisingly, ), and stylevars.scss (which holds the we are using).